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rebootor.c
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rebootor.c
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/* Teensy Rebootor
* http://www.pjrc.com/teensy
* Copyright (c) 2010 PJRC.COM, LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above description, website URL and copyright notice and this permission
* notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <avr/io.h>
#include <avr/sleep.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "usb.h"
#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
int main(void)
{
// set for 1 MHz clock
CPU_PRESCALE(4);
// set all pins as inputs with pullup resistors
#if defined(PORTA)
DDRF = 0;
PORTF = 0xFF;
#endif
DDRB = 0;
PORTB = 0xFF;
DDRC = 0;
PORTC = 0xFF;
DDRD = 0;
PORTD = 0xFF;
#if defined(PORTE)
DDRE = 0;
PORTE = 0xFF;
#endif
#if defined(PORTF)
DDRF = 0;
PORTF = 0xFF;
#endif
// initialize USB
usb_init();
// do nothing (USB code handles reboot message)
while (1) {
_delay_ms(1);
// put the CPU into low power idle mode
set_sleep_mode(SLEEP_MODE_IDLE);
cli();
sleep_enable();
sei();
sleep_cpu();
sleep_disable();
}
}